2017
年12月英语六级阅读模拟试题及详解答案
　　Renewable Energy
　　Inthepast
century,it
hasbeen
seen
that
theconsumption
ofnon-
renewable
sources
ofenergy
hascaused
more
environmental
damage
than
anyother
human
activity.
Electricity
generated
from
fossil
fuels
such
ascoal
andcrude
oilhasledtohigh
concentrations
ofharmful
gases
intheatmosphere.This
hasinturn
ledtomany
problems
being
faced
today
such
asozone
depletion
andglobal
warming.
Vehicular
pollution
hasalso
been
amajor
problem.
　　Therefore,alternative
sources ...